Kivy ScrollView blur2 (without Blur)

gistfile1.txt

from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout

from kivy.properties import StringProperty

from kivy.base import runTouchApp
from kivy.lang import Builder

Builder.load_string('''
<ScrollableLabel>:
    orientation: 'vertical'
    canvas.before:
        Color:
            rgba: 1, 1, 1, 1
        Rectangle:
            pos: self.pos
            size: self.size

    Label:
        text: str('some really really long string' * 10)
        size_hint_y: .8
        font_size: '20sp'
        text_size: self.width-10, None
        color: 0, 0, 0, 1
        #blurs text:
        size_hint_y: None
        height: int(self.texture_size[1]+10)
        valign: 'top'

    BoxLayout:
        orientation: 'vertical'
        size_hint_y: .2
        Button:
            text: 'Bla1'
            font_size: 20
        Button:
            text: 'Bla2'
        Button:
            text: 'Bla3'
''')

class ScrollableLabel(BoxLayout):
    pass

runTouchApp(ScrollableLabel())